Move page titles into the top header bar to reclaim vertical space

PageHeader now sets title via context instead of rendering inline.
TopBar displays the current page title and subtitle in the left area
that was previously an empty spacer. Content area gains ~40px of
vertical space on every page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/layout/DashboardShell.tsx

@@ -2,6 +2,7 @@
 
 import { ReactNode } from 'react';
 import { DataProvider } from '@/lib/data-context';
+import { PageTitleProvider } from '@/lib/page-title-context';
 import { Sidebar } from './Sidebar';
 import { TopBar } from './TopBar';
 import { MobileActivityFAB } from '@/components/ui/MobileActivityFAB';
@@ -10,6 +11,7 @@ import { DashboardData, DashboardConfig } from '@/types/data';
 export function DashboardShell({ children, initialData, config }: { children: ReactNode; initialData: DashboardData; config: DashboardConfig }) {
   return (
     <DataProvider initialData={initialData} config={config}>
+      <PageTitleProvider>
         <div className="flex h-screen overflow-hidden">
           <Sidebar />
           <div className="flex-1 flex flex-col min-w-0">
@@ -20,6 +22,7 @@ export function DashboardShell({ children, initialData, config }: { children: Re
           </div>
           <MobileActivityFAB />
         </div>
+      </PageTitleProvider>
     </DataProvider>
   );
 }

src/components/layout/TopBar.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { useData, DatePreset } from '@/lib/data-context';
+import { usePageTitle } from '@/lib/page-title-context';
 import { format } from 'date-fns';
 import { useState, useRef, useEffect } from 'react';
 import { DISTRICTS } from '@/types/data';
@@ -15,6 +16,7 @@ const DATE_PRESETS: { value: DatePreset; label: string }[] = [
 
 export function TopBar() {
   const { filters, setDistricts, setDatePreset, refresh, isLoading, lastRefreshed, clearAllFilters, clearCrossFilter } = useData();
+  const { title, subtitle } = usePageTitle();
   const [showDistrictDropdown, setShowDistrictDropdown] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
@@ -51,8 +53,15 @@ export function TopBar() {
         <span className="font-bold text-sm text-brand-dark-blue">AgentMinder</span>
       </div>
 
-      {/* Desktop spacer */}
-      <div className="hidden lg:block flex-1" />
+      {/* Page title */}
+      <div className="hidden lg:flex flex-1 items-center gap-2 min-w-0">
+        {title && (
+          <>
+            <h1 className="text-sm font-bold text-foreground truncate">{title}</h1>
+            {subtitle && <span className="text-xs text-muted truncate hidden xl:inline">— {subtitle}</span>}
+          </>
+        )}
+      </div>
 
       {/* Active filters indicator */}
       {filters.crossFilter && (

src/components/ui/PageHeader.tsx

@@ -1,15 +1,20 @@
 'use client';
 
+import { useEffect } from 'react';
+import { usePageTitle } from '@/lib/page-title-context';
+
 interface PageHeaderProps {
   title: string;
   subtitle: string;
 }
 
 export function PageHeader({ title, subtitle }: PageHeaderProps) {
-  return (
-    <div className="mb-6">
-      <h1 className="text-xl font-bold text-foreground">{title}</h1>
-      <p className="text-sm text-muted mt-0.5">{subtitle}</p>
-    </div>
-  );
+  const { setPageTitle } = usePageTitle();
+
+  useEffect(() => {
+    setPageTitle(title, subtitle);
+    return () => setPageTitle('', '');
+  }, [title, subtitle, setPageTitle]);
+
+  return null;
 }

src/lib/page-title-context.tsx

@@ -0,0 +1,39 @@
+'use client';
+
+import { createContext, useContext, useState, useCallback, ReactNode } from 'react';
+
+interface PageTitleState {
+  title: string;
+  subtitle: string;
+}
+
+interface PageTitleContextValue extends PageTitleState {
+  setPageTitle: (title: string, subtitle: string) => void;
+}
+
+const PageTitleContext = createContext<PageTitleContextValue>({
+  title: '',
+  subtitle: '',
+  setPageTitle: () => {},
+});
+
+export function PageTitleProvider({ children }: { children: ReactNode }) {
+  const [state, setState] = useState<PageTitleState>({ title: '', subtitle: '' });
+
+  const setPageTitle = useCallback((title: string, subtitle: string) => {
+    setState(prev => {
+      if (prev.title === title && prev.subtitle === subtitle) return prev;
+      return { title, subtitle };
+    });
+  }, []);
+
+  return (
+    <PageTitleContext.Provider value={{ ...state, setPageTitle }}>
+      {children}
+    </PageTitleContext.Provider>
+  );
+}
+
+export function usePageTitle() {
+  return useContext(PageTitleContext);
+}